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Table 2

Association of demographic characteristics and interventions with study participants’ reports of ARI during outbreak of pandemic (H1N1) 2009 at a boarding school, England*

Variable

No. participants

No. (%) with ARI

Odds ratio (95% CI)

Total

695

237 (34.1)

Demographics

Category

Students

469

187 (39.9)

2.53 (1.75–3.65)

Staff

226

50 (22.1)

1

Age group, y

13–15

219

75 (34.2)

1

16–18

250

112 (44.8)

1.55 (1.06–2.28)

20–49

111

32 (28.8)

0.70 (0.42–1.15)

>50

87

18 (20.7)

0.48 (0.26–0.86)

Sex, staff only†

F

109

24 (22.0)

1

M

117

26 (22.2)

0.98 (0.52–1.83)

Role, staff only

Nonteaching

135

26 (19.3)

1

Teaching

85

23 (27.1)

1.48 (0.78–2.82)

Interventions

Took antiviral drugs

No

198

81 (40.9)

1

Yes

393

110 (28.0)

0.55 (0.38–0.79)

Use of antiviral drugs: PEP vs. treatment dose

No antiviral drugs

198

81 (40.9)

1

Yes, PEP

352

78 (22.2)

0.40 (0.27–0.59)

Yes, treatment dose

41

32 (78.1)

4.87 (2.20–10.77)

Completion of PEP course of antiviral drugs†

No antiviral drugs

198

81 (40.9)

1

Not completed

51

14 (27.5)

0.44 (0.17–1.15)

Completed

294

62 (21.1)

0.38 (0.22–0.65)

Seasonal Influenza vaccine

No

216

66 (30.6)

1

Yes

425

161 (37.9)

1.35 (0.95–1.92)

*Categories in which the response was missing or unknown are shown in the Table A1. ARI, acute respiratory infection; CI, confidence interval; PEP, postexposure prophylaxis.†Excluding those who reported taking the treatment dose of antiviral drugs.

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